There are many causes of unilateral nasal congestion, first of all, you need to go to the hospital to check the electronic rhinoscopy and sinus CT. the diseases that cause unilateral nasal congestion are as follows: first, acute simple rhinitis, which is due to acute inflammatory infection and leads to acute congestion, edema and hyperplasia of the turbinates, patients will have alternating nasal congestion, headache, yellow nasal discharge and other related symptoms. The treatment requires symptomatic anti-inflammatory treatment, and the nasal cavity can be cured in about a week by using Daphne Linn nasal aerosol topically. Second, unilateral nasal congestion due to nasal tumors, tumors including nasal polyps, fibrovascular tumors, malignant lymphoma, etc.. If abnormal neoplasm is found, local pathology needs to be taken first, and then surgery is needed after the diagnosis is confirmed. Third, unilateral nasal congestion caused by deviated septum and chronic hypertrophic rhinitis. Deviated nasal septum is caused by congenital abnormal development of the nasal septum, which can be seen as C-shaped or crestal deviation. If the deviated septum is found to be accompanied by nasal congestion, surgical treatment is required. Patients can usually be cured by endoscopic correction of the deviated septum and partial excision of the inferior turbinate.